Leaf turner



April 11, 1933. E. BAF RTELS 1,903,727

LEAF TURNER Filed May 14, 1930 V 5 Sheets-Sheet 1 INVENTOR j ggficzrfiils ATTORN EY I April 11, 1933. E. BARTELS 1,903,727

LEAF TURNER Filed May 14, 1930 5 Sheets-Sheet 2 INVENTOR i; 5a 72% Z5 mmi.

ATTORNEY E. BARTELS LEAF TURNER April 11, 1933.

Filed May 14, 1930 5 Sheets-Sheet 5 n N R m A Patented Apr. 11, 1933 EBITST BABTELS, OI BANDOENG, JAVA, DUTCH EAST INDIES LEAF TURNER Application filed m 14,

This invention relates to leaf turners for books, music and the like.

A primary object of the invention is to construct a leaf turner which will operate indefinitely without necessitating any resetting of the mechanism.

Another object is to so construct such a mechanism that by a. simple pressure of a switch closing button the leaf of a book or sheet of music will be turned and the mechanism automatically reset ready for turning of the next leaf when the button is again actuated.

Another object is to so construct a music leaf turner that after a leaf has been turned it will be engaged and held by automatically operating means which when the next leaf is to be turned will be released and thrown out of the way to provide for the reception of the on-coming leaf and will then drop into engagement with said leaf and hold it until the next leaf is to be turned.

In carrying out these objects, the invention is susceptible of a wide range of modification without departing from the spirit or sacrificing any of the advantages of the claimed invention; there being shown in the drawings for illustrative purposes a preferred and practical form, in which:

- Figure 1 representsa top plan view of a music leaf turner constructed in accordance with this invention withthe leaf turning arm shown in inoperative position in full line and in operative actuating position in dotted line;

Fig. 2 is a longitudinal vertical section thereof with parts broken out and in elevation;

Fig. 3 is an enlarged detail longitudinal section showing the means for releasing the leaf engaging member;

Fig. 4 is a horizontal section taken on the line 44 of Fig. 3;

Fig. 5 is atransverse section taken on the line 55 of Fig. 2;

Fig. 6 is an enlarged detail section showing the mechanism which controls the leaf holding device;

Fig. 7 is a similar View showing the mecha- 1930. Serial No. 452,368.

nism in a different position with the leaf holder elevated to release the leaf;

Fig. 8 is a horizontal section taken on the line 8-8 of Fig. 2;

Fig. 9 is a vertical section taken on the line 9-9 of Fig. 8;

Fig. 10 is an enlarged detail sectional view showing the vacuum controlling valve and its operating mechanism;

Fig. 11 is a detail perspective view of the leaf holding device detached;

Fig. 12 is a longitudinal section taken on the line 12-42 of Fig. 11;

Figs. 13, 14 and 15 are detail perspective views of the cams and their cooperating arts which control the operation of the leaf holder;

Fig. 16 is a diagrammatic view of the elec tric circuit which controls the operation of the mechanism.

In the embodiment illustrated the invention is shown in connection with a music holding stand including a base 1 from which rises a supporting standard 2 having a motor containing casing 3 adjustably mounted thereon and held by set screw or thumb screw 4.

The motor 5 mounted in the casing 3 is designed to be actuated or brought into operation by means of a push button or switch located at a point remote and indicated at S in Fig. 16. It is of course understood that the motor 5 may be of any suitable or desired construction capable of performing the duties which will be required of it. The shaft 6 of this motor has a gear wheel 7 mounted thereon as shown clearly in Fig. 2 with which meshes a cooperating gear 8 carried by a shaft 9 mounted in a suitable bearing 10 of an enclosing casing 11. This shaft 9 has a worm 12which meshes with a Worm gear 13 carried by a shaft 14 which is journalled in a suitable bearing 15 here shown projecting laterally from one side wall of the casing 11. Fixed to the shaft 14 which carries the worm gear 13 is a mutilated disk or cam 16 for a. purpose presently to be described.

A crank arm 17 is also fixed to the shaft 14 and to the free end thereof is pivotally connected a link 18 which extends up into a slotted at its lower end as shown at 21, it

being understood there are two of these 810s, sun's or thepistn rodiand through which are designed to pro'ect lat: erally extendin studs 22 carriedb t elower end of a rack SE'w'hieH eXten s through the piston rod and the piston carried by said rod through an ofilening in the'npper wall of the housing. 's rack bar 23 has teeth 24 on one edge nearits 11 per end and i186 isiprowided. with aslaterall-y extending downturn'ed finger 26in! a purpose presently tdbedesctihed." .l; I Y

The piston25 operates in; a cylinder 1% some at the upqg'nendiof the casing 1 as shown clearly in ig 2 and this piston'op- Grates-tin theeyhndemto provide a vacuum inifiieghhmber 2711mm the piston. is moved downwardl will ;be prwently il'lil v n ",1 h i Mounted onztheg'upqs'end of the cylinder lflaedsi'aihnusingflfi t an opening. in the upper wall of rabid! theunok bar. '23 1s "'li:;b to meiproeate. Journalled in-suitmi'in ;in thehnuain 28 at the ri ht Hind mil t 'reoi isle, she 29 which as fixed thereto in longitudinall spaced relatrioii twoigears'xirfl and 31. G ear 31 meshes tlrexaek bar 23 while gear 80 meshes with the teeth of. a mu bar 32 which extends inaiplaneat right angles to he jljlok bar 23wlindzis-mounted in suitable i 11in 28, and is designed to. 'procatein saidtearingh ff'eAn'll l oon'duit'33 exten long tudinally efstheihousingz28 here shown 1nd on the bottom thereof and is equipped at the end thereof adjacent the hmmin 19 with a head alrhoyingalateral thmde extension de- 1" to be detachabl'y. mounted in the upper endoi: head of the vaeuumohamber 27, see Fi'fiifliand dflweihe air 'duct or canal 36 Whisk; extends longitudinally through the member 33 also extends through the head 34 thereot being' ofisetr'at its junction with the head and"thei body of the member 33 and then-extends the extension 35 pro- :vidin communication between the vacuum them 27 and-the-canalof the member 33. Loelledimthe head 34 and intersecting the air duds-therein is awsrticslly movable valve 37' which'has a transverse air duct or canal 38 therein designedto' register when the valve iseimnormali. open position with the conduit infimmember iiii and with the conduitin the extension =85 theneby bringing into communicifim these conauits -"withesch other and witfi the interior of the vacuum chamber. Arranged beneath -tins valve 37 is a coiled 1* w fiighxgxerts its tension to normally hereinafter described it will operate to engage said valve and force it inward against thetension of. the s g 39 thereby cutting ofi cbmmunic'ation'g veen the air ducts in the member 33 and extension 35 and connecting the duct 38 with the atmosphere as shown clearly in Fig. 10 and which is designedfor a purpose hereinafter to bedescribed.

The outenend oithe rack bar 32 has an offset terminal 32a which is provided wlth raekteeth arranged on an edge in a laneat right angles to the teeth'atthe rend thereof. .t 1

An arm is swingably mounted on the outer end of the housing 28 and has a lateral 'w' V"'raek-bar-is' retra'eted in a manner Q extension 5 1;atits inner which extends into the housing 28 and on which extension is fixedly. mounted a block or, gear 52 having teeth 53 extending around a. Pportion of its peripher asshown clearlyin ig. 13. Asp pressed pin 54 is mounted in the untoothe portion of the gear 5.2- and projects be and the lower face thereof as shown clear y Fig. 7 it being designed to ride on the upper face ot a; cam 60 which is mounted on a b ock 55 carried by an upstanding portion 830 of the. ember 33. The cam has on itslower face atone side, thereof a dependin cam finger 61 and on its upper face is provi ed with two inclined recesses or teeth 62 and '63 which are arran e i the path of the in 54 for purpose a.

m agl'ane at ight angles to the housing 28 w on so arra ed is designed to hold its pinfimember 0 enga with the leaf t e boo in connection with which itis to be Depending from the free end of the arm 50 is the leaf gripping member 70. This member is composed of a rubber leaf eng member 71 provided with a plurality of suetion cups 2'2 in its outerface which communicate by conduits 73 with a: conduit Hertendi'rig longitadinallybfanann "75 which car'- ries at its free end the plate or rubber block 71. This arm 7 5 which is swing'ably connected with the arm 50 by means of a shaft 7 6 is designed to normal depend arm 503mg plansat right anglls thereto as-shown clearly in Fig. 2 in which position it is adapted to engage the leaf of the book in connection with which it is to be used.

The outer end of the arm which carries 5 the depending leaf engaging member 70 is shown provided with an enlargement or head 57 to accommodate the operating mechanism for the leaf gripping member 70 as will be now described.

The shaft 76 to which is fixed the arm 75 of the leaf gripping member 7 0 extends transversely through the head 57 of arm 50 and has fixedly secured thereto a gear wheel 77 which meshes with the teeth of a rack bar 78 mounted to slide longitudinally in the head 57, the operation of which controls the swinging movement of the member 70 relative to arm 50.

A coil spring 79 is connected at one end with the rack bar 78 and at its other with the wall of the chamber of the head 57 within which said bar is mounted and exerts its tension to retract or draw the bar 78 within the head. A leaf spring 80 is shownengaging and forcing the bar 78 upward to insure the meshing of the teeth thereof with the gear 77.

A cylinder 81 is formed in the inner portion of the head 57 and a piston 85 is mounted to reciprocate therein. A threaded closure 82 closes the outer end of the cylinder 81 and has a channel or small conduit 83 extending obliquely therethrough and communicating with the conduit 58 which extends longitudinally through the arm 50 and through the extension 51 of said arm. This conduit 58 communicates with a co-extensive conduit a in the member 55 and through said conduit 55a communicates with the conduit 36 so that a continuous air passage is formed from the vacuum chamber 27 through the member 33 and its connection with the arm 50 and through said arm 50 to the piston cylinder 81. The conduit 58 in the arm 50 also extends into a conduit 76a in the shaft 76 and through this conduit 7 6a communicates with the conduit 74 which leads to the vacuum cups 72 on the leaf gripping member 70. The release of vacuum in the ducts 58 and 76a is necessary for two purposes, first, to release member 70 from its grip on the paper and second, to guide piston 85 backward. that is to the left. See Figs. 3 and 4.

A piston rod 86 which carries at its front end the piston 85 extends rearwardly through the outer end wall of the cylinder 81 into the chamber 59 in which the rack 78 is mounted and is designed to cooperate with said bar 78 in a manner presently to be described.

'A coiled spring 87 is arranged between the rear face of the piston 85 and the end wall of the cylinder 81 as shown clearly in Figs. 3 and 4 and operates whenexpanded to project the piston 85 into the position shown in Fig.

2 which is the position the piston occupies when vacuum is on in the chamber 27 and when the vacuum in said chamber 27 is released the vacuum at the rear of the piston 85 will operate to draw it in the position shown in Figs. 3 and 4 compressing the spring 87 when so doing.

A leaf holding member 90 is mounted in the outer end of the casing 28 and is designed to extend in a direction opposite to that occupied by the leaf gripping member when the parts are in operation as shown in Fig. 1, the member 70 being in position to engage the leaf to be turned while the member 90 engages the leaf which has been turned and by means of which both of said leaves are held open for the inspection of the reader. This leaf holder 90 as shown is made in the form of a skeleton plate 91 rotatably mounted on a rod 92 and yieldably held by means of a coil spring 93, which is connected at one end with said rod and at the other end with the plate 91 as shown clearly in Figs. 11 and 12.

The rod 92 depends from the free end of an arm 94. Arm 94 is journalled in one side wall of the housing 28 and has secured to the end of said arm which is mounted within the housing a coiled spring 95 the free end of which has radially extending finger 96 adapted to be engaged with one wall of the housing as is shown clearly in Figs. 6 and 7. This spring 95 is designed to return the arm 94 to initial position after it has been swung upwardly by engagement of the cam 61 with a laterally ext-ending lug 97 on the arm 94 which occurs at predetermined intervals controlled by the swinging of the arm 50 which carries the leaf turning element 70. It is of course understood that it is necessary to swing the leaf holding member 90 up out of the path of the oncoming turned leaf which is carried by the member 70 and after said turned leaf has been properly positioned in relation to the other turned leaves the member 90 is lowered into operative engagement therewith by means of the coiled spring 95.

Mounted on an insulating plate 65 are two contact fingers 66 and 67 the finger 66 engaging the periphery of the mutilated cam 16 and the finger 67 has a downturned end 68 arranged above and in the path of the finger 66 so that when said finger 66 is raised by the circular portion of the cam 16 the contacts will be closed and the circuit completed \Vhen the disk 16 has turned sufficiently to bring the mutilated portion thereof under the finger 66 said contact or finger will drop onto said portion and thereby move away from the contact 68 breaking the circuit and stopping the motor.

In the use of this apparatus the parts being in the position shown in Figs. 1 and 2 in full line with the contacts 66 and 67 open, when the button is depressed the current energizes the motor 5 causing it to turn to the right and through the gears 7, 8, shaft 9, worm 12, and

nr and n 'cident to the gearfl3 rotates the mutilated disk or cam 16 and through it'sconnection with link '18 and piston 20 retracts or moves the i'ston downward in the vacuum cylinder produc- 5 ing; vacuum in advance of the piston which causes suction through the air conduits conneotod'with the vacunm chamber of the cylinder. as will be presently more fully described, and at the sametime when the piston 0 reaches a redeterniinedfioint the studs 22 was in bar 23 becoming engagedwith the sndof'theslot 21 ox'ertsa pu'll onthe rack V Y moving it inward and'through its-mesh rug engagementwith the gear 31- causes gear Q75 to operate the rack bar 32 toward the right. This movement of the rack bar 32 causes the goal 52 on the outer end of the rack bar 32 to be turned toward the ri t and thereby win the arm carrying t e leaf engaging mana er 70 in the direction of the arrows shown 1. It is to be understood'that this operation is bein performed while the mutilated or cam 16 is turning under ,s thowinfiuence ofthe energizing of the motor 5 lildxwhen it reaches the fiat portion therein or rather when the flat portion comes under the-contact 66 this contact drops and separates from contact d? breakingthe circuit v and eutting'ofl. the motor. operation of the piston, rack bars, andjgears to swing. the leaf engaging member 70 carried by the arm 50 in the direction of the'arrows shown in F 1 turns the leaf with which said member 70 is engaged, the suction Jag or. vacuum produced in chamber 27 by th downward movement of the piston 25 operates hhro h the airconduit or channel which "eaten s throughthe members 33, 55, and

'74 to the'vacuumrcups 72 carried by the memher 79 and operates thereby to securely hold the page or leaf to be turned in contact with this member so that when the arm 50 is turned outwardly the leaf engaged by the member 70 will be turned with it.

* When the member 70 carrying the leaf to turned has travelled to degrees or into the dotted line position of the member- 70 shown-in Fig. 1 the finger-61 of the cam 60 will engage the finger 97 and lift the leaf gripping member 91 through an angle of about 90 degrees moving it out of engagement withthe leaf at the left which it has been holding so as to clear'the way for the oncoming leaf carried by the member 70. At the 55 moment when this leaf gripping or holding member 91 is raised the leaf carried by the member 70 will be'moved to the left against the Iltaves already there and. immediately thereafter the member 91 will lower again-inof the cam 61 from under the finger '97 and the tension of the spring 95 and the new leaf will their become fixed at the left and held by the member 91.

Atthe instant the arm 50carrying the leaf 55 member 70 has travelled .through degrees the finger 26 of the rack bar 28 will have been lowered into engagement with the valve 37 and press said valve inward against the tension of spring 39 cutting ofi communication between the vacuum chamber curs the piston 85 moves outwardly or tom wards the left underthe vacuum in the rear thereof and compresses the spring 87 as shown in Figs. 3 and 4. When this occurstbe rack bar 78 is moved longitudinally outward and upward into the position shown in Fig. U 3 and this movement of said rack bar 0 rates through the gear 77 to swing the arm Gear;- rymg the leaf gripping member 70 upward to permit the leaf which it has been carrying to pass from under it without noise and into position to be held by the member 90. 7

It will thus be seen that after the arm-50 has travelled through an arc of degrees and deposited the leaf to be turned attheleft of the book it will underaction of the spring U 56 be swung back into initial position as shown at Fig. 1 in full lines ready for the next operation. I"

The-rack bar 78 has a laterally extending stud 78a near its inner end resting on the rib 88 which is disposedat amineline as shun clearly in Fig. 3. This rib. 88 is preferably arrangedon an incline of about 30 degrees so that the stud 78a sliding along this rib will guide the bar 78 causingthe bar 78 to be. tilted as shown in Fig. 3 and at that moment the arm 75 carrying the leaf gripping member 70 reaches its extreme upward position and the piston rod 86 passes above the inner end of bar 78 as shown in Fig. 3 and permits 310 the bar 78 to swing back to normal position under the tension of the spring 79 and move the piston 85 back to the positionshownin Fig.2 ready for the next operation.

The swinging back of he arm 50 into-ini- 5 tial position causes the rack bar 32 to move toward the right thereby operating through the gears 30 and 31 to raise the bar 23 which carries with it the finger 26 thus releasing the valve 37 and permitting it under the P120 action of the spring 39 to move outward into operative position as shown in Fig. 2 with the air conduit in the member 32 and extension 35 in register ready for the operation .of

the piston on the next pressing of the electric 7 button. g

It is ofcourse understood that whenthe spring 79 pulls the rack bar 78 backward, the leaf spring 80 operates to push it upward and thus bring it into alinement with the use piston rod 86 ready for the next operation. The push button S shown in Figs. 2 and 16 controls the circuit to the motor 5 when the same is depressed through wires 121 and 122 which are enclosed in the sheath 120, shown in Fig. 2. The wires 121 and 122 are connected with a source of current as shown in Fig. 16 and such connection will be made usually with a house supply.

Wire 123 connects wire 121 with the contact member 66 while wire 124 connects the contact 67 with wire 122. Thus it will be seen that the motor 5 will be started by the push button S but will be maintained in a closed circuit through the contacting members 66 and 68. When, however, the cam 16 has reached the position shown in Fig. 16, the current to the motor will be broken when the parts 66 and 68 are separated.

From the above description it will be seen that this leaf turner when once set may be operated repeatedly by a quick pressure and release on the push button which is located convenient to the operator so that all the leaves of a book may be turned without any resetting of the mechanism.

.It is of course to be understood that this apparatus may be used in connection with music stands, book rests, or any other suit able support. It is also understood that the arm 50 may be made of varying lengths to adapt it for use in connection with books of different sizes.

When it is desired to turn the leaf of the book from left to right in a direction opposite to that shown in the drawings, and which of course will necessarily be done manually, the leaf turner is raised to disengage the leaf engaging elements or the book may be lowered and when the leaves have been freed from the members 70 and 90 the leaf or leaves may be turned back and forth at the will of the operator, and after the proper place has been found the leaf turner may be again placed in operative position as shown.

Without further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art, and it will, of course, be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention or its scope as claimed.

I claim:

1. In a leaf turner a supporting structure, an arm swingably mounted on said structure, a leaf engaging member swingably mounted on said arm, vacuum controlled means connected to operate said member and the arm, automatic means for producing and releasing the vacuum whereby said member and arm may be swung simultaneously for positioning the leaf and for moving the leaf engaging member away from the leaf and for .returningthe arm and member to an operative position.

2. In a leaf turner a supporting structure, an arm swingably mounted on said structure, a leaf engaging member swingably mounted on said arm, vacuum controlled means connected to operate said member and the arm, electric means under the control of an operator for producing and releasing the vacuum whereby said member and arm may be swung in one direction on the forming of the vacuum, and means automatically operable on the release of the vacuum for moving the member away from the leaf and for resetting the leaf engaging member.

3. In a leaf turner a supporting structure, an arm swingably mounted on said structure, a leaf engaging member swingably mounted on said arm, vacuum controlled means connected to swing said member and arm in one direction, means operable by theswinging of said arm to release the vacuum, means for moving the member away from the leaf, and means for returning the arm and leaf engaging member to initial position on the release of the vacuum.

4. A leaf turner comprising a supporting structure, an arm swingably mounted on said structure, a leaf engaging member swingably mounted on said arm, suction means carried by said member to engage the leaf to be turned, means for producing suction in said leaf engaging means, means operable by said suction producing means, to swing said arm and leaf engaging member a predetermined distance, and suction releasing means operable by the means which controls the swinging movement of the leaf engaging member to disengage said member from the leaf when it reaches a predetermined point and means for automatically returning the parts to initial position.

5. In a leaf turner a supporting structure, a leaf engaging and turning member swingably mounted on said structure, means for operating said turning member, means for engaging and holding the leaf after it has been turned by said turning member, means for releasing said holding means and moving it out of the path of an oncoming leaf and operable by the movement of the turning member, and means for returning said leaf holder to engage the turned leaf and hold it until the approach of the next leaf.

6. In a leaf turner a supporting structure, a leaf engaging member swingably mounted on said structure, means for actuating said swingable member, a leaf holder to engage and hold the leaf after it has been turned by said turning member, means for releasing said holding means and moving it out of the path of an oncoming leaf, said means being actuated by the swinging of the leaf turning means and means for returning said m ggaadd lmldmg means and movm it out mews: an oncoming leaf, sai means aetuated by the swinging of the leaf I means and means for returning said to operative position to engage We turned leaf, and means operable to swin at l f engaging ember upward out 0 ea path of thetumed leaf and permit the leaf which it has been carrying to pass from under, it in the'position to be held by the holder. 8. time leaf turner a supporting structure, alea! engaging'and turn ng member swingably mmmted on said structure, means for balding the leafafter it has been turned, mean; fer' oper ating'said leaf turning memher and means operable by the leaf turnin member to release the holding member and swing it outof the way of the approach of the turned leaf.

9. In a leaf turner a supportin structure, a a leaf engaging and turning mem r swingablymounted on said structure, means for holding the leaf after it has been turned, means for operating said leaf turning memher and v. means operable b the leaf turning a member to release the ho ding member an swing it nut of the'way of the approach of the turned leaf, and means for returning said leaf holder to engage the turned leaf and holdit until the a roach of the next leaf.

. RNST BARTELS. 

